Fixing nested for loop in python

Question

I'm trying to write a piece of code that will compute values of wavelengths in such a way that for while n = 1, it checks the values for k = 2, 3, 4, 5 and 6. And I need to to do that up to n = 4, with 5 sequential integers k starting from n + 1. IE if n = 3, check for k = 4, 5, 6, 7, and 8. So there will be a total of 20 wavelengths. The code I currently have prints out 20 wavelengths, with the first one being correct for each n, but the next 4 are incorrect. I'm not sure how to fix this, please help

for n in range (1, 5):
    for k in range (2, 7):
        k = n + 1
        RH = 1.09678e-2
        waveLength = 1 / (R_H * (1/n**2 - 1/k**2))
        print(waveLength)

What should the result look like?

Seyi Daniel
– Seyi Daniel

2020-09-11 19:24:20 +00:00
Commented Sep 11, 2020 at 19:24 — Seyi Daniel
– Seyi Daniel, Commented Sep 11, 2020 at 19:24

Barmar · Accepted Answer · 2020-09-11 19:28:44Z

2

Your inner loop is using the same k = n + 1 value every time, not using the value of k that comes from range(2, 7).

The range in the inner loop needs to be based on n, not fixed numbers.

for n in range(1, 5):
    for k in range(n+1, n+6):
        RH = 1.09678e-2
        waveLength = 1 / (R_H * (1/n**2 - 1/k**2))
        print(waveLength)

Another way to do it would be to use range(1, 6) in the inner loop, and add the two values:

for n in range(1, 5):
    for m in range(1, 6):
        k = n + m
        RH = 1.09678e-2
        waveLength = 1 / (R_H * (1/n**2 - 1/k**2))
        print(waveLength)

edited Sep 11, 2020 at 19:28

answered Sep 11, 2020 at 19:14

Barmar

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2 Comments

Seyi Daniel Over a year ago

The result isn't different from OP's

Barmar Over a year ago

Yes it is. He's ignoring the inner range, because he sets k = n + 1.

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